package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.time.LocalDateTime;

/*
* 自定义切面，实现公共字段自动填充
* */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {

    //切入点
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut() {}

    //前置通知, 实现公共字段自动填充
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint) {
        log.info("开始进行公共字段自动填充...");

        //获取方法上的注解,是update还是insert
        MethodSignature signature = (MethodSignature)joinPoint.getSignature();
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);
        OperationType operationType = autoFill.value();
        //获取当前被拦截的方法的参数-实体对象
        Object[] args = joinPoint.getArgs();
        if (args==null || args.length==0){
            return;
        }
        Object entity = args[0];
        //准备赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();
        //根据当前不同的操作类型，为对应的属性通过反射来赋值
        if(operationType==OperationType.INSERT){
            try {
                //通过反射为属性赋值
                entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME,LocalDateTime.class).invoke(entity,now);
                entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME,LocalDateTime.class).invoke(entity,now);
                entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER,Long.class).invoke(entity,currentId);
                entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER,Long.class).invoke(entity,currentId);
            }catch (Exception e){
                e.printStackTrace();
            }
        }else if(operationType==OperationType.UPDATE){
            try {
                //通过反射为属性赋值
                entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME,LocalDateTime.class).invoke(entity,now);
                entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER,Long.class).invoke(entity,currentId);
            }catch (Exception e){
                e.printStackTrace();
            }
        }

    }

}
